Synonyms for Welt (same or very similar meaning)
WordNet sense 1 (a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions):
wale, weal, whealWordNet sense 2 (beat severely with a whip or rod):
flog, lash, lather, slash, strap, trounce, whip, latherFrom the ODE community, based on WordNetadd/edit